Improvement in steam-generators



' ZSheets-Sheetl. J. A.l MILLER.

, STEAM GENERATOR. No. 178.868. Patented June Z0, 1876.

WITNESSES.

zsheets-sheetz- J. A. MILLER.

STEAM GENERATOR.V No.17'8,858. Patented June 20,1876.

FIG.5.

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N. PETERS, FNOTO-LITHOGRAFH. WASHINGTON, D. C.

INVENTDH.

. -Iws PATENT f Frrca; L

JOSEPH A.` MILLER, OF PROVIDENCE, RHODE ISLAND.

Y n'IMPROVEMENT IN STEAMGENERATORS.

Specification forming partof Letters-PatentNo. 178,868, dated June '20, i876; application filed i April 12,1816. f

` hereby declare thatthe f'ollowing isafull, clear,

and exact description of the same, reference being had to the accompanying drawings, forming part of this specification. y

This invention has refercnce to Vimprovements in the construction and arrangement of auxiliary steam generators, which are con.

nected with steam-generators proper, and arranged to utilize more fully the radiated heat from the fuel, and is an improvement on my previous invention, for which Letters Patent where issued to me February 26, 1867, No.

62,494, and which were reissued January 18,

187 6, No.' 6,862. A

In the drawings, Figure l is a side view-of a steam-boiler with the auxiliary steam-generators attached, the wall being removed to show more clearly the arrangement andthe manner of connecting the same. Fig. 2 is a cross-scction, showing two steam-boilers with the auxiliary steam-generators attachedto the sides and between the boilers, as also the arrangement of connecting the same with the boilers. Fig. 3 is an enlarged view of two of the pipes out of which the auxiliary steam-generators are constructed, 011e being shown partly in section, and also the manner in which they are connected.

Auxiliary steam generators, forming the sides of the furnace, or a partition between two boilers, have heretofore been made in large slabs or boxes, or of al number of pipes or tubes, being firmly connectedeither ou both ends or on one end. Such boxes and clusters of pipes or tubes are liable to leak on accountI of the unequal expansion of the several parts. Portions of such auxiliary steam-generators are also liable to burn out or crack, and the whole or the larger portion of a side has to be removed; This could not be done without f much labor lin tacking down the fronts and A,the accumulation of heatin the water.

fer to arrange the auxiliary steamy-generators' 'within the same near the fire, has-to pass up' ward along the sides, such vertical surface being inferior to an inclined or conical surface.

In .my present invention these .defects are entirely'overcome. Thesides are constructed out of a .number of sections, a a, each form` ing a tapering cylindrical pipe, presenting an l efficient.heating-surface to the fire, and,'by vir! tue ofthe taper allowing the dii'erent pipes -to be connected by asimple gas-pipe connection, b, the fire can freely circulate around the tapering portion of the pipe. The connecting-pipe b, being below the action of the lire, cannot be injured. The upper parts of the pipes aa are connected with the'steam-space of the boilel` by suitable pipes arranged to allow of perfect freedom for expansion and contraction, as is shown in the drawings.

Any desired number of these pipes a a may be connected together, and .forni the sides of -the boiler, or partition between two boilers,the

wholebeing connected, by the pipesd andl E, with the rear ofthe boiler, and infront with the blow-off pipe and valve f, so that the water from theboiler may at lany time be blown through the lower part of the same, and the pipes be kept free from mud and sediment; the upper part being connected by the pipes ofc, either directly with the steam-boiler, or with a pipe which is connected with the. same, t as shown. The pipes a a may be arranged to extend to or above the water-line in 'the boilers, or they may be arranged so as to have their upper parts below the water-line. 'In the first instance theywill deliver to the boiler dry steam, while in the latter instance they will force large quantities of water mixed with steam into the boiler, as Iirmly believe that a rapid circulation of water in a steam-boiler will prevent `boiler-explosions by preventing l prewhen connected with boilers in which uo special vprovision for circulation is made, so'that a large andl constant dow'of water leaves the rear end of the boiler, passes into the` auxiliary steam-generators, and is discharged into the forward end of the boiler', mixed with steam, so as to insure a perfect circulation of the water.

The present improvement greatly facilitates i l "175,869 l l repairs incase of injury to one of the pipesaf, as `with `aid of en Ordinary gastongs-the upper and lower connection can be removed,` and a pipe be taken out through the tire-door .n without disturbing any other part. 4A` new` pipe may be insertediin the `serine manner through the iredoor,` and it' `no newfppeis etk hand "the spacellnay be temporarily leftrand ayeonnecting-pipe, b, long enoughxto connect the two neerestpipesfbe screwelin, andthe boiler run until a. new pipe,` aris secured.` i As the auxiliary ssteamfgeneretors `ere `made up ot' a number of like parts,` each pipe et `being4 e duplicatefofthe-others, the construction canv be more perfect, the cores, when cast, een be` `better supported, m1d,when welded to sheet luetalyspeciul tools may be provided,`wbich' couldnot have been done when made as here,-

lofore. l i l i By properly arranged eonnection`s,. these pipes a may be arranged around vertical steamboilers, es also around cnpolas, ovens, kilns,

l necting-pipesc c, saidippes ""ffa) beingurranged boilers, as `and forth'e pll'rpesedescribed;` n

and lurnaces,` sovasfto protectdthefbrclcwork l steam for` verionspurposesi Thusgunyshupe or fornrmty be surroundedwith" these generatorshy the" arrangeinentof the said conn tions.A f o t Havin g thus describednny invention;

lcleiln as new Iend `desirejto securepbyLettersnPt` In an auxiliary stelngeneretor, the "combis i nation-1` `of the cylindrical Vertically-nrrenged;" pipes a a, their 1ower`9pertgdilninishing d arneter,a.1`1d constructedlwithbosSeSltOfreceiv s the pipes or eonplingsvbtbfund"the upperjon-` n at the sides of thefurncef end connecvtedwitllf` the Water `nndsjteem;space of theboile ori JOSEPH A. MILLER Witnesses: n l l 1 n OSCAR Llu 1arenlny` 15 j JNO, D. PATTEN. l n 

